9090589d87
Convert acpi_device_lock to a mutex to avoid a potential race upon access to /proc/acpi/wakeup Delete the lock entirely in wakeup.c since it is not necessary (and can not sleep) Found-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Shaohua Li <shaohua.li@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
149 lines
4.0 KiB
C
149 lines
4.0 KiB
C
/*
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* wakeup.c - support wakeup devices
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* Copyright (C) 2004 Li Shaohua <shaohua.li@intel.com>
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*/
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#include <linux/init.h>
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#include <linux/acpi.h>
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#include <acpi/acpi_drivers.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include "internal.h"
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#include "sleep.h"
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/*
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* We didn't lock acpi_device_lock in the file, because it invokes oops in
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* suspend/resume and isn't really required as this is called in S-state. At
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* that time, there is no device hotplug
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**/
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#define _COMPONENT ACPI_SYSTEM_COMPONENT
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ACPI_MODULE_NAME("wakeup_devices")
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/**
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* acpi_enable_wakeup_device_prep - prepare wakeup devices
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* @sleep_state: ACPI state
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* Enable all wakup devices power if the devices' wakeup level
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* is higher than requested sleep level
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*/
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void acpi_enable_wakeup_device_prep(u8 sleep_state)
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{
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struct list_head *node, *next;
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list_for_each_safe(node, next, &acpi_wakeup_device_list) {
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struct acpi_device *dev = container_of(node,
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struct acpi_device,
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wakeup_list);
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if (!dev->wakeup.flags.valid ||
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!dev->wakeup.state.enabled ||
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(sleep_state > (u32) dev->wakeup.sleep_state))
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continue;
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acpi_enable_wakeup_device_power(dev, sleep_state);
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}
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}
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/**
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* acpi_enable_wakeup_device - enable wakeup devices
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* @sleep_state: ACPI state
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* Enable all wakup devices's GPE
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*/
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void acpi_enable_wakeup_device(u8 sleep_state)
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{
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struct list_head *node, *next;
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/*
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* Caution: this routine must be invoked when interrupt is disabled
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* Refer ACPI2.0: P212
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*/
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list_for_each_safe(node, next, &acpi_wakeup_device_list) {
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struct acpi_device *dev =
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container_of(node, struct acpi_device, wakeup_list);
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if (!dev->wakeup.flags.valid)
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continue;
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/* If users want to disable run-wake GPE,
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* we only disable it for wake and leave it for runtime
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*/
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if ((!dev->wakeup.state.enabled && !dev->wakeup.flags.prepared)
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|| sleep_state > (u32) dev->wakeup.sleep_state) {
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if (dev->wakeup.flags.run_wake) {
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/* set_gpe_type will disable GPE, leave it like that */
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acpi_set_gpe_type(dev->wakeup.gpe_device,
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dev->wakeup.gpe_number,
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ACPI_GPE_TYPE_RUNTIME);
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}
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continue;
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}
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if (!dev->wakeup.flags.run_wake)
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acpi_enable_gpe(dev->wakeup.gpe_device,
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dev->wakeup.gpe_number);
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}
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}
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/**
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* acpi_disable_wakeup_device - disable devices' wakeup capability
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* @sleep_state: ACPI state
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* Disable all wakup devices's GPE and wakeup capability
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*/
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void acpi_disable_wakeup_device(u8 sleep_state)
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{
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struct list_head *node, *next;
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list_for_each_safe(node, next, &acpi_wakeup_device_list) {
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struct acpi_device *dev =
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container_of(node, struct acpi_device, wakeup_list);
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if (!dev->wakeup.flags.valid)
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continue;
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if ((!dev->wakeup.state.enabled && !dev->wakeup.flags.prepared)
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|| sleep_state > (u32) dev->wakeup.sleep_state) {
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if (dev->wakeup.flags.run_wake) {
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acpi_set_gpe_type(dev->wakeup.gpe_device,
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dev->wakeup.gpe_number,
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ACPI_GPE_TYPE_WAKE_RUN);
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/* Re-enable it, since set_gpe_type will disable it */
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acpi_enable_gpe(dev->wakeup.gpe_device,
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dev->wakeup.gpe_number);
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}
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continue;
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}
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acpi_disable_wakeup_device_power(dev);
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/* Never disable run-wake GPE */
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if (!dev->wakeup.flags.run_wake) {
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acpi_disable_gpe(dev->wakeup.gpe_device,
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dev->wakeup.gpe_number);
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acpi_clear_gpe(dev->wakeup.gpe_device,
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dev->wakeup.gpe_number, ACPI_NOT_ISR);
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}
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}
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}
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int __init acpi_wakeup_device_init(void)
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{
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struct list_head *node, *next;
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mutex_lock(&acpi_device_lock);
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list_for_each_safe(node, next, &acpi_wakeup_device_list) {
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struct acpi_device *dev = container_of(node,
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struct acpi_device,
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wakeup_list);
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/* In case user doesn't load button driver */
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if (!dev->wakeup.flags.run_wake || dev->wakeup.state.enabled)
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continue;
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acpi_set_gpe_type(dev->wakeup.gpe_device,
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dev->wakeup.gpe_number,
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ACPI_GPE_TYPE_WAKE_RUN);
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acpi_enable_gpe(dev->wakeup.gpe_device,
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dev->wakeup.gpe_number);
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dev->wakeup.state.enabled = 1;
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}
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mutex_unlock(&acpi_device_lock);
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return 0;
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}
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